ESB-2016.3026.2 - UPDATE [Appliance] F5 Products: Denial of service - Remote/unauthenticated 2017-11-01

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             AUSCERT External Security Bulletin Redistribution

                              ESB-2016.3026.2
                K51444934: NTP vulnerability CVE-2016-7426
                              1 November 2017

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           F5 Products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-7426  

Reference:         ESB-2016.2803

Original Bulletin: 
   https://support.f5.com/csp/#/article/K51444934

Revision History:  November  1 2017: Patch information updated
                   December 20 2016: Initial Release

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K51444934: NTP vulnerability CVE-2016-7426

Security Advisory

Original Publication Date: Dec 20, 2016
Updated Date: Nov 01, 2017

Applies to (see versions):

  o Product: BIG-IQ, BIG-IQ Cloud, BIG-IQ Device, BIG-IQ Security, BIG-IQ ADC,
    BIG-IQ Centralized Management
      5.1.0, 5.0.0, 4.6.0, 4.5.0, 4.4.0, 4.3.0, 4.2.0, 4.1.0, 4.0.0
  o Product: BIG-IP, BIG-IP AAM, BIG-IP AFM, BIG-IP Analytics, BIG-IP APM,
    BIG-IP ASM, BIG-IP DNS, BIG-IP Edge Gateway, BIG-IP GTM, BIG-IP Link
    Controller, BIG-IP LTM, BIG-IP PEM, BIG-IP PSM, BIG-IP WebAccelerator
      13.0.0, 12.1.2, 12.1.1, 12.1.0, 12.0.0, 11.6.2, 11.6.1, 11.6.0, 11.5.5,
      11.5.4, 11.5.3, 11.5.2, 11.5.1, 11.5.0, 11.4.1, 11.4.0, 11.2.1, 10.2.4,
      10.2.3, 10.2.2, 10.2.1
  o Product: Enterprise Manager
      3.1.1
  o Product: F5 iWorkflow
      2.0.2, 2.0.1, 2.0.0
  o Product: LineRate
      2.6.1, 2.6.0, 2.5.2, 2.5.1, 2.5.0
  o Product: ARX, ARX
      6.4.0, 6.3.0, 6.2.0
  o Product: F5 WebSafe
      1.0.0
  o Product: Traffix SDC
      5.1.0, 4.4.0, 4.0.5, 4.0.2, 4.0.0
  o Product: BIG-IQ Cloud and Orchestration
      1.0.0

Security Advisory Description

NTP before 4.2.8p9 rate limits responses received from the configured sources
when rate limiting for all associations is enabled, which allows remote
attackers to cause a denial of service (prevent responses from the sources) by
sending responses with a spoofed source address. (CVE-2016-7426)

Impact

When the ntpd process is configured with rate limiting for all associations,
the limits are also applied to responses received from its configured sources.
An attacker who knows the sources (for example, from an IPv4 refid in a server
response), and knows the system is configured in this way, can periodically
send packets with spoofed source addresses to keep the rate limiting activated
and prevent the ntpd process from accepting valid responses from its sources,
resulting in a denial of service (DoS).

This vulnerability can be exposed when ntpd configurations use the limited
directive. The BIG-IP system's default ntpd configuration does not specify the
limited directive. The limited directive cannot be added to the configuration
using the Configuration utility, but can be added using the TMOS Shell (tmsh).

The limited directive is most commonly used as part of the default restriction
with other directives such as the noquery directive. For example, restrict
default limited noquery nomodify.

Security Advisory Status

F5 Product Development has assigned ID 630969 (BIG-IP) and INSTALLER-2824
(Traffix SDC) to this vulnerability. Additionally, BIG-IP iHealth may list
Heuristic H51444934 on the Diagnostics > Identified > Low screen. 

To determine if your release is known to be vulnerable, the components or
features that are affected by the vulnerability, and for information about
releases or hotfixes that address the vulnerability, refer to the following
table:

+---------------+----------------+-----------------+----------+----------------+
|               |Versions known  |Versions known to|          |Vulnerable      |
|Product        |to be vulnerable|be not vulnerable|Severity  |component or    |
|               |                |                 |          |feature         |
+---------------+----------------+-----------------+----------+----------------+
|               |                |13.0.0 HF1       |          |                |
|               |                |12.1.2 HF1       |          |                |
|               |13.0.0          |11.6.2           |          |                |
|BIG-IP LTM     |12.0.0 - 12.1.2 |11.6.0           |Low       |ntpd            |
|               |11.6.1          |11.5.0 - 11.5.2  |          |                |
|               |11.5.3 - 11.5.5 |11.4.1           |          |                |
|               |                |11.2.1           |          |                |
|               |                |10.2.1 - 10.2.4  |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |                |13.0.0 HF1       |          |                |
|               |13.0.0          |12.1.2 HF1       |          |                |
|BIG-IP AAM     |12.0.0 - 12.1.2 |11.6.2           |Low       |ntpd            |
|               |11.6.1          |11.6.0           |          |                |
|               |11.5.3 - 11.5.5 |11.5.0 - 11.5.2  |          |                |
|               |                |11.4.1           |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |                |13.0.0 HF1       |          |                |
|               |13.0.0          |12.1.2 HF1       |          |                |
|BIG-IP AFM     |12.0.0 - 12.1.2 |11.6.2           |Low       |ntpd            |
|               |11.6.1          |11.6.0           |          |                |
|               |11.5.3 - 11.5.5 |11.5.0 - 11.5.2  |          |                |
|               |                |11.4.1           |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |                |13.0.0 HF1       |          |                |
|               |13.0.0          |12.1.2 HF1       |          |                |
|BIG-IP         |12.0.0 - 12.1.2 |11.6.2           |          |                |
|Analytics      |11.6.1          |11.6.0           |Low       |ntpd            |
|               |11.5.3 - 11.5.5 |11.5.0 - 11.5.2  |          |                |
|               |                |11.4.1           |          |                |
|               |                |11.2.1           |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |                |13.0.0 HF1       |          |                |
|               |                |12.1.2 HF1       |          |                |
|               |13.0.0          |11.6.2           |          |                |
|BIG-IP APM     |12.0.0 - 12.1.2 |11.6.0           |Low       |ntpd            |
|               |11.6.1          |11.5.0 - 11.5.2  |          |                |
|               |11.5.3 - 11.5.5 |11.4.1           |          |                |
|               |                |11.2.1           |          |                |
|               |                |10.2.1 - 10.2.4  |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |                |13.0.0 HF1       |          |                |
|               |                |12.1.2 HF1       |          |                |
|               |13.0.0          |11.6.2           |          |                |
|BIG-IP ASM     |12.0.0 - 12.1.2 |11.6.0           |Low       |ntpd            |
|               |11.6.1          |11.5.0 - 11.5.2  |          |                |
|               |11.5.3 - 11.5.5 |11.4.1           |          |                |
|               |                |11.2.1           |          |                |
|               |                |10.2.1 - 10.2.4  |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP DNS     |13.0.0          |13.0.0 HF1       |Low       |ntpd            |
|               |12.0.0 - 12.1.2 |12.1.2 HF1       |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP Edge    |None            |11.2.1           |Not       |None            |
|Gateway        |                |10.2.1 - 10.2.4  |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|               |                |11.6.2           |          |                |
|               |                |11.6.0           |          |                |
|BIG-IP GTM     |11.6.1          |11.5.0 - 11.5.2  |Low       |ntpd            |
|               |11.5.3 - 11.5.5 |11.4.1           |          |                |
|               |                |11.2.1           |          |                |
|               |                |10.2.1 - 10.2.4  |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |                |13.0.0 HF1       |          |                |
|               |                |12.1.2 HF1       |          |                |
|               |13.0.0          |11.6.2           |          |                |
|BIG-IP Link    |12.0.0 - 12.1.2 |11.6.0           |Low       |ntpd            |
|Controller     |11.6.1          |11.5.0 - 11.5.2  |          |                |
|               |11.5.3 - 11.5.5 |11.4.1           |          |                |
|               |                |11.2.1           |          |                |
|               |                |10.2.1 - 10.2.4  |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |                |13.0.0 HF1       |          |                |
|               |13.0.0          |12.1.2 HF1       |          |                |
|BIG-IP PEM     |12.0.0 - 12.1.2 |11.6.2           |Low       |ntpd            |
|               |11.6.1          |11.6.0           |          |                |
|               |11.5.3 - 11.5.5 |11.5.0 - 11.5.2  |          |                |
|               |                |11.4.1           |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP PSM     |None            |11.4.1           |Not       |None            |
|               |                |10.2.1 - 10.2.4  |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP         |None            |11.2.1           |Not       |None            |
|WebAccelerator |                |10.2.1 - 10.2.4  |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |13.0.0 HF1       |          |                |
|BIG-IP WebSafe |12.0.0 - 12.1.2 |12.1.2 HF1       |Low       |ntpd            |
|               |11.6.1          |11.6.2           |          |                |
|               |                |11.6.0           |          |                |
+---------------+----------------+-----------------+----------+----------------+
|ARX            |None            |6.2.0 - 6.4.0    |Not       |None            |
|               |                |                 |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|Enterprise     |None            |3.1.1            |Not       |None            |
|Manager        |                |                 |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Cloud   |None            |4.0.0 - 4.5.0    |Not       |None            |
|               |                |                 |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Device  |None            |4.2.0 - 4.5.0    |Not       |None            |
|               |                |                 |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Security|None            |4.0.0 - 4.5.0    |Not       |None            |
|               |                |                 |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ ADC     |None            |4.5.0            |Not       |None            |
|               |                |                 |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ         |                |5.0.0 - 5.1.0    |Not       |                |
|Centralized    |None            |4.6.0            |vulnerable|None            |
|Management     |                |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Cloud   |                |                 |Not       |                |
|and            |None            |1.0.0            |vulnerable|None            |
|Orchestration  |                |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|F5 iWorkflow   |None            |2.0.0 - 2.0.2    |Not       |None            |
|               |                |                 |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|LineRate       |None            |2.5.0 - 2.6.1    |Not       |None            |
|               |                |                 |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|Traffix SDC    |5.0.0 - 5.1.0   |None             |Low       |ntpd            |
|               |4.0.0 - 4.4.0   |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+

Security Advisory Recommended Actions

If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by upgrading to a version listed
in the Versions known to be not vulnerable column. If the table lists only an
older version than what you are currently running, or does not list a
non-vulnerable version, then no upgrade candidate currently exists.

Mitigation

None. To avoid vulnerability exposure, F5 recommends removing the limited
directive from ntpd restriction statements.

Impact of action: Various F5 product features rely on proper date and time
configuration; ensure that any modifications to the ntpd configuration are
compatible with your environment.

Supplemental Information

  o K9970: Subscribing to email notifications regarding F5 products
  o K9957: Creating a custom RSS feed to view new and updated documents
  o K4602: Overview of the F5 security vulnerability response policy
  o K4918: Overview of the F5 critical issue hotfix policy

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